#!usr/bin/python
#coding:utf-8

from __future__ import division

def jia(x,y):
    return x+y

def jian(x,y):
    return x-y

def cheng(x,y):
    return x*y

def chu(x,y):
    return x/y

def operator(x,o,y):
    if o == "+":
        print jia(x,y)
    elif o == "-":
        print jian(x,y)
    elif o == "*":
        print cheng(x,y)
    elif o == "/":
        print chu(x,y)
    else:
        pass

if __name__ == "__main__":
    print cheng(3,5)
